Pump



H. BECKER Aug. 23, 1932.

PUMP

Filed Feb. '7,

1930 3 Sheets-Sheet l H. BECKER Aug. 23, 1932.

PUMP

Filed Feb. '7, 1930 3 Sheets-Sheet 2 I all I VIII rill] I .Il/l In .llll I J I n I I I I n I e. u l I l n n l a Aug. 23, 1932 H. BECKER rumr Filed Feb. 1950 3 Sheets-Sheet 3 Jig. 8.

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J HmQLM Patented Aug. 23, 1932 UNITED A ES PATENT orFIca HEINRICH ackus, or .AUosBURG; eanmanvgassrenon 'ro 'mascmnmvrnam anesanne-nuaivsans a. G., or auesnua ennmany, a ooaronh'rron' or en;-

MANY.

' rum 1 Application arearem-{air 7, 1930, Serial in. 4 6,576,- and m Germany l'ebruary 13;1929.

This invention relates to pumps and more particularly to pumps for supplying air or the'like under pressures.

More particularly the invention is-cn- Z8 cerned with air pumps for supplying air under pressure to internal combustion engines for scavenging burnt gases from the combustion chambers. Heretofore air pumps for internal combustion engines for supplying scavenging air to clean the burntgases from the combustion chambers of doubleacting engines or the like have been generally arranged so that the suction and pressure valves of the pump were generally'arranged about the outside of the pump cylinder, this cylinder" being therefore more or less sur,- rounded by them.- This arrangement has the disadvantage of requiring a comparatively large space and resulting in a construction of substantial size, larger unitseven being so broad and high as to require more'space' than the combustion engine with which the pump is corrected." 4 Y One object of the present invention is, therefore, to provide a pump having the pressure and suction pump valves compactly arranged in series extending enerally at right angles to the direction of the pump cylinder axis. i

Another object of the invention is the provision of a series of pump valves arranged in line and comprisinga' number of automatically operable disc members, the series being enclosed in a housing which is provided with suitable passages communicating with the pump cylinder and with the suction and pressure chambers of the pump. y Other objects and advantages" of the ina vention will be apparent from the following description, accompanying claims, and the attached drawings. I s 1 a In the drawings v v Fig. 1 is a view of a scavenging pump associated with acombustion engine and em bodying the present invention;

Fig. 2 is a vertical section through the cylinder along the line AB of Fig.1;

Fig. 3 is a horizontal section taken through the cylinder along theline C,D ofFig. 1;

Fig. 4 is another sectionalview taken along the line EF of Fig.1; Fig. 5 is a side new of a pump associated with a portion of an engine, and'showing another form offmy invention;

Fig. 6 is a verticalsection on the line Gi -H of'Fig. '5; v I

Fi 7 is a horizontal section on the line I- of Fig. 5;

Figs. 8 to 12 show various arrangements of pump valves in pumps. having a number of pump units or cylinders arranged in tandem, Figs. 8 and 9 showing in section a pump having two pistons arranged in tandem, Figs. 10 and 11 showingFtwo cylinder pumps in side elevation and ig. 12 showing a multicylinder pump in side elevation having a common inlet valve series and a common outlet valve s'eries at each end of each cylinder and provided in the spaces betweenadj acent cylinders; and I "Fig. 13 is a section taken-longitudinally of a series of valves showing a modified valve construction. 1 I a a i In accordance with the present invention the pump, which may be an air pump for supplyingscavengin'g air to a doublesacting combustion engine, is provided with suction .and pressure valves for controlling theflow of fluid'to and from the pump cylinder respectively, in the form of automatic annular plate-or disc members suitably'mounted in a valve housing orhousin'gs'and which, in a single cylinder pump, are preferably arranged transversely of the cylinder'at the cylinder ends. In a multicylinder pump they are preferably transversely arranged with respect tothe pump axes and in the space between ad acent pump cylinders near the cylinder ends.

Figs. l to 4 show one form-of the present invention in which there is a single pump e ton for supplying scavenging 8D. or the to the combustion engine. Within the pump cylinder a is a piston 72 mounted onthe piston rod 0 which is operably connected inany suitable manner preferably to the crank shaft of theengine. The pump cylinder a is surrounded by a'casing d ,which, together with the cylinder casing a, provides achamber divalves i and. outlet valves j vided by the partition wall'e into the suction chamber 7' and the pressure chamber g. These chambers, as shown, are located on opposite sides of the cylinder axis. The flow 0 air or other fiuid 5.0 and from the pump cylinder is controlled by automatically operated suction and pressure valves which are shown in the form of disc or plate valve members. Suitable spring means, not shown, normally serve to hold the valve members against their seats until such time as the suction created by the moving piston during the suction stroke or the pressure created thereby during the compression or working stroke of the pump overcomes the spring pressure at which time the valves automatically open. These valves are arranged in suitable housings which are provided with passages so that one side of each suction valve is in communication with the suction chamber while the other side of the suction valve is in communication with the interior of the pump cylinder. The pressure valves are similarly arranged so-as to communicate with the pressure chamber and'also with the interior of the pump cylinder.

As shown in Fig. 2 there is a series of inlet arranged in a straight line at the upper end of the cylinder a and a similar series at the lower end of the cylinder, transverse of the cylinder axis. As shown in this figure the valve disc members are arranged on a common tube or sleeve shown in the form of a bolt hand are enclosed within a cylindrical housing on the cylinder cover. The arrangement on the supporting tube It is such that the suction valves 2' and the pressure valves y' alternate facing oppositely. If desired, the various suction valves 1' may be grouped separately in a single series adjacent one end of the cylinder, while the pressure valves 1' may be separately mounted in a second series adjacent thereto. The valve housing at the upper end of the cylinder, see Fig. 2, has a seriesof slots 7:: between the various valves, opening into the cylinder, and slots 1 and m connect the valve housing with the suction chamber f and the pressure chamber 9 respectively.

Four slots or holes I leading to the suction chamber 7 are shown extending through one side of the housing, while three similar holes or slots m are provided on the opposite side of the housing between each pair of pressurevalves j in thesame manner as is indicated in Fig. 3 which shows the valve arrangement at the lower end of the pump cylinder. Openings n and 0 in the pump casing d act as intake ports for the'fresh air for the suction chamber f and outlet ports for the compressed'air from the pressure chamber 9 respectively.

When the piston b descends, fresh airis drawn from the suction chamber 7 through the openings Z in the valve housing and past the opened suction valves 2' and into the slot each series extending in a direction only is in the pump cylinder. As the piston ascends, the air drawn into the cylinder is compressed and as soon as the air pressure exceeds the spring pressure of the pressure valves j, it is forced through the slots k past the pressure valves in-the valve housing and from there through the slots m into the pressure chamber 9 from which the scavenging air passes to any suitable scavenging air tank. The mode of operation is the same for the lower side of the piston. By reason of a construction of this sort a very compact construction is provided, and the space required by the valves is minimized. This of course increases the capacity of'a given sized pump so that piston operated scavenging pumps can be utilized in locations where space requirements have made this impossible.

Referring now to the construction shown in Figs. 5 to 7 inclusive, the cylinder a is divided into two superposed chambers a, a by the transverse partition p, see Fig. 5. Two connected piston members I) and b operate in these two chambers, these piston members being connected to a common piston rod 0. The pump cylinder (1 is surrounded or enclosed by a casing d which, together with the pump cylinder portions a and (1 forms the suction chambers fand f and the pressure chambers g and 9 The cylinder ends support the air valves in sleeve housings on each side of the cylinder axis so that the valves are arranged in line transversely of the cylinder axis. The suction and the pressure valves alternate with one another and are in communication with the respective cylinder portions through the slots lo. The slots Z similar to the slots Z of Fig. 2 connect the valve housing with the suction chambers f and f and slots similar to the slots m of Fig. 3 are also provided to connect the valve housing with the pressure chambers g and g. The construction at the upper and lower ends of the pump is preferably symmetrical. On the inner sides of the two pump cylinders the valves are arranged in parallel rows in the partition wall p, one row g containing the suction valves 11 while the other row r contains solely the pressure valves 9'. The row of suction valves 2' is connected through slots 8 and s in the valve housing with both the suction chambers f and f and also connected with the two cylinder portions a and th a pair of suction valves and a pair of pressure valves, bein connected to the slots u for the upper cylin er portion a while the slots at are in communication with the slots t for the lower Cylinder portion.

The operation of sucha divided cylinder pump is the same as that of the single cylinder pump previously described. When the piston descends, both the piston portions b and I) suck fresh air from the suction chambers f and 7 through the suction valves '5 of the upper and intermediate valve sleeves, both pump cylinder portions being simultaneously efiective. At the same time the air'previously drawn in below the piston is being compressed and forced out through the pressurev'alves in the intermediate and lower series.

Referring now to Figs. 8 to 12, forms of air pumps are shown in which there are a number of pump cylindersarranged side by side, the several pump cylinders being surrounded by a common casing. The suction and pressure valves 2' and j may be arranged between adjacent cylinders instead of extending transversely through the cylinder.

In a multicylinder pum as shown in Fig. 8 for example, there may e a series of suction and pressure valves adjacent the upper ends of the two adjacent cylinders to which they are both connected, and a similar series of valves is arranged adjacent the lower ends of the cylinders, these valves being positioned between the two adjacent cylinders, in the pump casing. The valves will therefore require no additional space and a very compact structure is thus obtained. Fig. 10 shows a two cylinder pump having a series of inlet valves 2' and a series of outlet nr pressure valves 7' adjacent each end of each of the cylinders and between the adjacent cylinders, there being thus four series of valves for each individual cylinder. In Fig. 11 there is shown a two cylinder pump having common inlet valves 2', these being arranged in two series one adjacent each end of the pump cylinders. Each cylinder is provided with a series of outlet or pressure valves jadjacent each end thereof, as shown. Where the pump is a multicylinder pump as shown in Fig. 12, such a construction as shown in Fig. 11 may be extended, so that there is aseries of inlet valves and a series of pressure or outlet "alves adjacent each end of each cylinder, each series of inlet valves thus serving two adjacent cylinders to form a very compact construction.

In the various valve constructions so far described the annular disc members of the Valves are arranged in rows upon a supporting sleeve or bolt and in the cylindrical sleeve valve housing of the pump cover. Instead of a. construction of this sort however the valve members or discs may be arranged in a cylindrical housing without utilizing a supporting bolt. Such an arrangement is shown in Fig. 13, the various movable valve members being suitably guided in the housing which is sup ported in suitable bores 'inthe pump cover or in the intermediate partition between two adjacent pum sections 1 While the orms of apparatus hereindescribed constitute preferred embodiments of the invention, it is to be understoodthat the invention is not limited to these precise-forms of apparatus,- and that changes may be made thereln without departing from the-scope of the fluid flow, said valves comprising a series I of automaticallyoperable valve members arranged in line, and a valve housing for said series of valve members formed as a hollow cylinder arranged in a direction extending transverselyof the cylinder axis and across an end of the cylinder, said housing having ports communicating directly with the cylinder'. r i 2. A pump of the character described comprising a pump cylinder,-a piston operable therein, pressure and suction valves for controlling the fluid 'flow'from and to said cylinder respectively, arranged in a' straight line extending transversely with respect to the cylinder axis, and a-common 'valve housing for said pressure and suction valves.

3. A pump of the character described comprising a pump cylinder, 8. piston operable therein, a series-of automatically operable valve disks for-controlling the fluid flow to and from said cylinder, a hollow cylindrical housing for said valve disks'slightly larger in diameter than said valve disks and having openings communicatin'gdirectly with the inside of the pump cylinder, and a common supporting member on which'saidvalve disks.

are mounted.

4. A pump of the character described comprising a pump cylinder, a piston operable thereln, and a'series of valves at each endof said cyllnder arranged in a dlrectionextending transversely with respect to the cylinder axis, each series comprising anumberof pressure outlet valves controlling the flow of fluid from thecylinder and a number of suction inlet valves controlling the flow of fluid to the cylinder.

5. A pump of the character described comprising a pump cylinder, a piston operable therein, a pump casing'extending around 6. A pump ofthe character described comprising a pump cylinder, :1 piston operable therein, a pump casing enclosing said cylinder and roviding a pressure chamber and a suction c amber, and a series of automatically operated pressure and suction valves for controlling the flow of fluid from and to said cylinder, and a valve housing for said series of valves, said valve housin having connections to. said pump cylin er, said pressure chamber and said suction chamber. 10 7. A pump of the character described comprising a pump cylinder, a piston operable therein, and including two axially spaced piston members, and a series of inlet valves or controlling the flow of fluid to the cyl- I. u inder arranged in a straight line extending transversely through the cylinder between said iston members.

8. pump of the character described comprising a pump cylinder, a. piston operable 20 therein, a. series of valves arranged in a straight line extending transversely with respect to the cylinder axis and including a number of spaced automatically operable disc members for controlling only flow of u fluid to the cylinder, and a second series of disc members arranged in a straight line extending transversely with respect to the cylinder axis for controlling only the flow of fluid from the cylinder, and a common a tubular housing for said two series.

9. A pump of the character described comprising cooperating cylinder and piston members, inlet and outlet valves for controlling the flow of fluid to and from said a members comprisin a plurality of series of automatically opera le disc members. and a straight tubular valve housing for each series arranged transversely with respect to the cylinder axis across an end of the cylino der and spaced to one side of said axis.

10. A multicylinder air pump for use with internal combustion engines comprising aseries of cylinders arranged in line, pistons for said cylinders, a common pump casing u for said cylinders, and a series of inlet and outlet valves for controlling the flow of fluid arranged in a'straight line extending transversely of the cylinder axes adjacent the ends of a pair of adjacent cylinders and provided in said pump casin 11. A pump of the c aracter described comprisin a cylinder, a casing around said cylinder orming a. suction chamber and a discharge chamber, inlet valves communi- 'cating with said suction chamber and with said cylinder, outlet valves arranged coaxially with said inlet valves and communicating with said c linder and said pressure p chamber, said va ves being located partially within said chambers to reduce the over-all dimension of said pump.

In testimony w ereof I have aflixed my signature.

HEINRICH BECKER. 

